The Democrats’ extensive losses in the 2010 and 2014 midterms (as well as other off-year elections in 2009, 2011, 2015 and the Governors races in 2012) have left their party hollowed out beneath the White House, which is one reason why the top two contenders in their presidential primary are a 68-year-old who arrived in Washington in 1993, and a 74-year-old who has never held a leadership position in Congress. But beyond the sheer numbers of losses in the Senate, House, Governorships, and state legislatures, there is also the fact that the GOP is building a strong, deep farm team...